I found something online from a Shotgunworld.com discussion on frame sizes. The following excerpt was likely penned from our own researcher Dave Noreen in Sept. 2010:
"When the 28-gauge was introduced, they were built on the 20-gauge's 0-frame. Actually there is a good body of evidence that Parker Bros. took a bunch of 20-gauge guns that were languishing in inventory, and fitted them with 28-gauge barrels and moved some inventory. Later they added the 00-frame with a 15/16 inch firing pin spacing for a lighter weight 28-gauge then the early guns. Finally, circa 1926, they introduced the 000-frame with a 13/16 inch spacing for the .410-bore. "
That 13/16 works out to .812 inch.
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